传热实验数据处理

1、五、实验数据记录及处理表一简单套管换热器数据传热管内径：18mm 传热管有效长度：1m 冷流体：空气 热流体：水蒸气序号123456空气流量读数P(kPa)0.510.781.323.124.79空气入口温度t1()30.632.333.836.438.944.4空气出口温度t2()64.163.762.662.462.364.3壁温tw()63.363.663.564.164.264.3空气在t1时的密度t1(kg/m3）1.1631.1571.1511.1411.1321.112空气平均温度tm（）47.354848.249.450.654.35空气在入口处流量Vt1(m3/h)16.20

2、820.04525.87732.09740.08949.673空气平均流量Vtm(m3/h)17.10221.07527.09233.44641.59351.230空气平均流速utm（m/s)18.67823.01729.58936.52845.42655.951空气在平均温度时的物性m(kg/m3)1.1011.0991.0981.0941.0901.077m*105(Pas)1.9491.9521.9531.9591.9651.983m*102(W/m）2.8142.8192.8212.8302.8402.869Cp(kJ/kg）1.0051.0051.0051.0051.0051.005

3、空气进出口温度之差t2-t1()33.531.428.82623.419.9壁面和空气的温差tw-tm（）15.9515.615.314.713.69.95空气得到的热量Q（kW）0.1760.2030.2390.2660.2960.306空气侧对流传热系数i(W/m2.）195.330230.195276.554319.563385.112544.821Re18990.20323315.29029937.36036707.54345340.88554682.901Nu124.930146.965176.464203.233244.112341.832Pr0.6960.6960.6960.69

4、60.6950.695Nu/(Pr0.4)144.415169.899204.007234.988282.297395.480Nu/(Pr0.3)139.276163.850196.742226.612272.224381.326图一图二表二强化套管换热器数据传热管内径：18mm 传热管有效长度：1m 冷流体：空气 热流体：水蒸气序号123456空气流量读数P(kPa)0.340.530.831.322.033.15空气入口温度t1()34.432.732.834.437.543.9空气出口温度t2()82.181.180.179.178.779.9壁温tw()64.564.464.464.6

5、64.765.1空气在t1时的密度t1(kg/m3）1.1491.1551.1551.1491.1371.113空气平均温度tm（）58.2556.956.4556.7558.161.9空气在入口处流量Vt1(m3/h)13.23416.52320.67726.07632.33740.281空气平均流量Vtm(m3/h)14.26117.83122.27627.97234.48242.569空气平均流速utm（m/s)15.57519.47424.32930.54937.66046.492空气在平均温度时的物性m(kg/m3)1.0631.0681.0691.0681.0641.051m*10

6、5(Pas)2.0011.9951.9931.9942.0012.019m*102(W/m）2.8992.8892.8852.8882.8982.928Cp(kJ/kg）1.0051.0051.0051.0051.0051.005空气进出口温度之差t2-t1()47.748.447.344.741.236壁面和空气的温差tw-tm（）6.257.57.957.856.63.2空气得到的热量Q（kW）0.2020.2570.3150.3730.4220.450空气侧对流传热系数i(W/m2.）571.662606.961700.088840.5491131.1312486.941Re14895.97918764.80923501.41029461.05236048.12743584.003Nu354.921378.205436.762523.968702.5541529.099Pr0.6940.6940.6940.6940.6940.693Nu/(Pr0.4)410.816437.696505.437606.3